Extron electronic RGB 202 Rxi Installation and Operation, cont’d LCD Display, Centering

Installation and Operation, cont’d

LCD Display

The RGB 202 Rxi and RGB 202 Rxi VTG’s front panel LCD display serves two main functions: to display the scanning rates of the input signal, and to indicate the horizontal and vertical centering limits. During VTG operation, the RGB 202 Rxi VTG’s LCD displays the VTG format, resolution and refresh rates.

LCD screen backlight

The LCD screen lights for 15 seconds at power-up, and it stays backlit as long as an input signal is present at the selected input. To force the backlight to remain off at all times except at power- up, set the rear panel No Backlight DIP switch to On.

See page 2-11 for details.

Scan rate indication

When the interface is powered on, the LCD lights for 15 seconds while it determines whether an input sync signal is present. If the No Backlight DIP switch is set to On, the LCD lights for three seconds only.

•If the interface does not detect an input sync signal, the LCD goes dark and displays “NO SIGNAL” until the interface receives an active sync signal.

•If the interface detects an input sync signal, the LCD displays the horizontal and vertical scan rates (sync frequencies) in the following format:

Hxxx.xxk

Vxxx.xHz

The first line shows the horizontal rate in kilohertz, and the second line shows the vertical rate in Hertz.

Centering

While the vertical () or horizontal () centering (shift) controls are being adjusted, the LCD displays “H-SHIFT” or “V-SHIFT”, respectively. That message remains on the LCD (in place of the scan rates) until the centering control has been inactive for 3 seconds. When a centering control reaches its minimum or maximum limit, the LCD displays “MIN” or “MAX” on the line below “H-SHIFT” or “V-SHIFT”.

If the centering controls are no longer active, the centering settings are saved, and the LCD displays the current scan rates.

If the DDSP DIP switch is set to On and a centering control is rotated, the LCD displays N/A DDSP ON, and the image does not shift on screen.

Operating the VTG (RGB 202 Rxi VTG only)

The RGB 202 Rxi VTG includes a limited video test generator. The VTG creates and outputs standard test patterns at fixed formats and resolutions so that a system can be set up and tested even when an input computer is not available.

To use the VTG, follow these steps:

1.	Set the front panel 202/VTG selection switch to VTG.
2.	Select an appropriate combination of output resolution
	and test pattern using the 16-position rotary switch on the
	front panel. Four different video test patterns are available
	for each of the four resolutions. Select the test patterns by
	rotating the switch within the appropriate resolution
	quadrant. The LCD displays the selected VTG format, the
	resolution, and then the scan rates.

The test patterns are shown below.

Left to right: crosshatch, H-pattern, 8 split-level grayscale, and 8 color bar test patterns

The four available resolutions are shown below.

Switch	Format	Resolution	Horiz.	Vert.
			rate	rate
quadrant		(pixels x lines)
			(kHz)	(Hz)
1	VGA 3	640 x 480	31.5	60
2	SVGA	800 x 600	37.9	60
3	VESA 3	1024 x 768	48.4	60
4	SGI	1280 x 1024	64.0	60

2-14 RGB 202 Rxi, RGB 202 Rxi VTG • Installation and Operation RGB 202 Rxi, RGB 202 Rxi VTG • Installation and Operation 2-15